package Test_2;

import java.util.Scanner;

public class test {
    public static class TreeNode {
        char val;
        TreeNode left;
        TreeNode right;
        public TreeNode(){}
        public TreeNode(char val) {
            this.val = val;
        }
    }
    //根据字符建一个二叉树
    public static void CreateTree(TreeNode root,String s) {

    }

    //先写一个先序遍历

    public static void main(String[] args) {
        TreeNode tree = new TreeNode();
        Scanner scan = new Scanner(System.in);
        String s = scan.next();

    }
}
